Grease bottom and sides of a 9-inch springform pan or a 10-inch cake pan with 3 tablespoons butter. Sprinkle evenly with brown sugar. Arrange pear slices in a pinwheel pattern on top of brown sugar. Place maraschino cherries and pecan halves in center of pinwheel.
Beat remaining 1/2 cup plus 1 tablespoon butter at medium speed with an electric mixer until fluffy; gradually add granulated sugar, beating well. Add eggs, 1 at a time, beating until blended after each addition. Add sour cream, beating until smooth. Add flour and next 3 ingredients, beating until batter is smooth. Spoon batter evenly over arranged pear slices.
Bake at 350° for 45 to 50 minutes or until a wooden pick inserted in center comes out clean. Cool in pan 15 minutes. Remove side of pan; invert onto a serving plate, and remove bottom of pan.